9/10=10/k

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Solution for 9/10=10/k equation: 


D( k )

k = 0

k = 0

k = 0

k in (-oo:0) U (0:+oo)

9/10 = 10/k // - 10/k

9/10-(10/k) = 0

9/10-10*k^-1 = 0

-10*k^-1 = -9/10 // : -10

k^-1 = 9/100

-1 < 0

1/(k^1) = 9/100 // * k^1

1 = 9/100*k^1 // : 9/100

100/9 = k^1

k = 100/9

k = 100/9

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